ExUnit

Spec sheet

What it does

ExUnit is a unit testing framework for Elixir.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Purpose

ExUnit is a unit testing framework for Elixir.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Intended users

The Elixir website describes Elixir as serving solo developers and Fortune 500 companies across varied industries and applications.Read 8 Oct 2026 · elixir-lang.org

License

The Elixir source code is released under the Apache License 2.0.Read 8 Oct 2026 · github.com

Founded

2012Read 28 Sep 2026 · hexdocs.pm

Assertions

ExUnit.Assertions provides macros that generate assertions with appropriate error messages.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Async execution

ExUnit.async_run/0 starts tests asynchronously while test cases are loading, and await_run/1 waits for the result.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Concurrency

Tests in different modules can run concurrently, while tests within each module run serially.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Configuration

ExUnit options include test timeouts, maximum parallel cases, failure limits, filters, logging capture, colors, and random seeds.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Mix integration

The Mix command mix test runs files matching *_test.exs in a project's test directory.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Parallel tests

Tests in different test modules can run concurrently, while tests within a module run serially.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Reporting

ExUnit supports result formatters and can report timing for the slowest tests or test modules.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Run tests

Mix's mix test command runs files matching *_test.exs in a project's test directory.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Security reporting

The Elixir repository asks users to disclose security vulnerabilities privately through its Security page.Read 8 Oct 2026 · github.com

Support channels

The Elixir website lists community support channels including Slack, the Elixir Forum, and Discord.Read 8 Oct 2026 · elixir-lang.org

Supported runtime

ExUnit is part of the Elixir programming language and the example invokes it using the elixir command line.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Test assertions

ExUnit.Assertions provides macros that generate assertions with appropriate error messages.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Test execution

ExUnit starts tests and can run them automatically before the VM terminates.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Test outcomes

Finished tests can pass, fail, be skipped, be excluded, or be invalid when setup_all fails.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Test setup

A basic ExUnit setup starts the framework with ExUnit.start() and defines tests in a module using ExUnit.Case.Read 8 Oct 2026 · ex-unit.hexdocs.pm

Plans and prices

Every ExUnit plan and price →

Where Specifiction places it

• Unit Testing Frameworks#4 of 328.3
• Unit Testing#6 of 328.2